The susceptibility to potato leafroll virus of over 150 species distributed among 39 families was determined. Inoculations were made by means of the peach aphid,Myzus persicae. The species considered susceptible are those from which the virus could be recovered 3 to 6 weeks following inoculation. Attempted recovery of virus was by means of aphids fed for 5 to 6 days on the test plants and then transferred to indicator plants,Physalis floridana, P. angulata orDatura stramonium. Nine species in the familyAmaranthaceae were tested and all were found to be susceptible.Nolana lanceolata was the only other non-solanaceous species definitely found to be susceptible. Of several solanaceous species tested, most were susceptible but a few were insusceptible under the conditions used. Infected plants of several solanaceous species were symptomless.